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In this paper an exact baseband equivalent model of a quadrature modulatedall-digital transmitter is derived. No restrictions on the number of levels ofa digital switched-mode power amplifier (SMPA) driving input, nor the pulseencoding scheme employed, are made. This implies a high level of generality ofthe proposed model. We show that all-digital transmitter (ADT) can berepresented as a series connection of the pulse encoder, discrete-time Volterraseries model of fixed degree and memory depth, and a linear time-varying systemwith special properties. This result suggests a new analytically motivatedstructure of a digital predistortion (DPD) of SMPA nonlinearities in ADT.Numerical simulations in MATLAB are used to verify proposed baseband equivalentmodel.

Novel Baseband Equivalent Models of Quadrature Modulated All-Digital Transmitters